What is constructive possession of a firearm?
Police constructively posses firearms. Hunters, or sportsmen that enjoy shooting are also carrying constructively. Legal uses of guns are able to be carried constructively. ADDED
: The initial answer is not exactly correct; In the law "constructive possession" means being close enough, or in near enough proximity to something, to be able to easily control it or have access to it. You don't have to ACTUALLY have it ON your person, just close enough or handy enough to it.